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Changes between Initial Version and Version 1 of Ticket #34359, comment 26

initial	v1
3	3	Was thinking more about avoiding the `wp_mkdir_p()` call on (very) busy sites with persistent cache. That seems to be the slowest part of `wp_upload_dir()` and is needed only once a month when uploading a file.
4	4
5		We have to keep calling it so we are 100% backwards compatible. If a theme uses `wp_upload_dir()` on the front end on a busy site, it is called many thousands of times every day for no good reason :)
	5	We have to keep calling it so we are 100% backwards compatible. If a theme uses `wp_upload_dir()` on the front end on a busy site, or if there is a gallery in the post, it is called many thousands of times every day for no good reason :)